[[Wikipedia:UNIX System V|System&nbsp;V]]-derived, [[Endianess|big endian]] MIPS UNIX with BSD and POSIX extensions, for the computer systems made by the former [[Wikipedia:MIPS_Computer_Systems,_Inc.|MIPS Computersystems, Inc.]] including the MIPS Magnum 3000 (also known as [http://www.netbsd.org/Ports/mipsco/ mipsco]), Microsoft/MIPS Magnum 4000 ([[Jazz]]), M120 and more.

[[Wikipedia:UNIX System V|System&nbsp;V]]-derived, [[Endianess|big endian]] MIPS UNIX with BSD and POSIX extensions, for the computer systems made by the former [[Wikipedia:MIPS_Computer_Systems,_Inc.|MIPS Computersystems, Inc.]] including the MIPS Magnum 3000 (also known as [http://www.netbsd.org/Ports/mipsco/ mipsco]), Microsoft/MIPS Magnum 4000 ([[Jazz]]), M120 and more.

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RISC/os also had maybe the most inflated syscall interface as can be seen in this header file defining the [http://www.linux-mips.org/git?p=linux.git;a=blob;h=4d8eb15461eb6a6e30a8193c38734b1d98691dbc;hb=f578894cb9e92729f3c2dd4f48480f6c04008d1a;f=include/asm-mips/riscos-syscall.h RISC/os syscalls]. The basic structure is:

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RISC/os also had maybe the most inflated syscall interface as can be seen in this header file defining the [//git.linux-mips.org/?p=ralf/linux.git;a=blob;h=4d8eb15461eb6a6e30a8193c38734b1d98691dbc;hb=f578894cb9e92729f3c2dd4f48480f6c04008d1a;f=include/asm-mips/riscos-syscall.h RISC/os syscalls]. The basic structure is:

* 0 - 999 System&nbsp;V&nbsp;Release&nbsp;4 flavored syscalls

* 0 - 999 System&nbsp;V&nbsp;Release&nbsp;4 flavored syscalls

* 1000 - 1999 System&nbsp;V syscalls. All flavors of IRIX use this number range as well.

* 1000 - 1999 System&nbsp;V syscalls. All flavors of IRIX use this number range as well.

Line 7:

Line 7:

* 3000 - 3999 POSIX syscalls

* 3000 - 3999 POSIX syscalls

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The Linux system call interface is derived and extends this by adding (see [http://www.linux-mips.org/git?p=linux.git;a=blob;f=include/asm-mips/unistd.h asm-mips/unistd.h]):

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The Linux system call interface is derived and extends this by adding (see [//git.linux-mips.org/?p=ralf/linux.git;a=blob;f=arch/mips/include/asm/unistd.h arch/mips/include/asm/unistd.h]):